The One Direction hunk is close friends with the couple and dotes on their 20-month-old little girl Alaia-Mai and can't resist splashing out on expensive gifts for her.
Marvin said: ''Niall spoils her rotten. He bought her a Burberry mac for her christening present and then this Christmas he just went nuts in Selfridges and bought her a load of designer clothes.''
Though Marvin enjoys doing ''lads stuff'' with the 'Steal My Girl' singer, he says his pal enjoys hanging out with Rochelle just as much.
He said: ''He's friends with both of us, so I'll do lads stuff with him - like I went to Vegas for his 21st and we had a lads' holiday out there for that - and then he'll come round to the house and just chill with Rochelle and have a curry if I'm out working.''
While the couple are protective of their friend, Marvin insists they don't vet his potential girlfriends but he thinks being single is the right thing for the star at the moment.
He told heat magazine: ''He's not silly. He's seen a lot of the world now and I think he can make a good judgement.
''I think he's doing the right thing being single right now. He'll settle down with the right person at the right time, I'm sure.''
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